skia WIPjarred/canvas

1 files changed, 45 insertions, 0 deletions

diff --git a/src/deps/skia/include/core/SkCubicMap.h b/src/deps/skia/include/core/SkCubicMap.h
new file mode 100644
index 000000000..7389b92af
--- /dev/null
+++ b/src/deps/skia/include/core/SkCubicMap.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkCubicMap_DEFINED
+#define SkCubicMap_DEFINED
+
+#include "include/core/SkPoint.h"
+
+/**
+ *  Fast evaluation of a cubic ease-in / ease-out curve. This is defined as a parametric cubic
+ *  curve inside the unit square.
+ *
+ *  pt[0] is implicitly { 0, 0 }
+ *  pt[3] is implicitly { 1, 1 }
+ *  pts[1,2].X are inside the unit [0..1]
+ */
+class SK_API SkCubicMap {
+public:
+    SkCubicMap(SkPoint p1, SkPoint p2);
+
+    static bool IsLinear(SkPoint p1, SkPoint p2) {
+        return SkScalarNearlyEqual(p1.fX, p1.fY) && SkScalarNearlyEqual(p2.fX, p2.fY);
+    }
+
+    float computeYFromX(float x) const;
+
+    SkPoint computeFromT(float t) const;
+
+private:
+    enum Type {
+        kLine_Type,     // x == y
+        kCubeRoot_Type, // At^3 == x
+        kSolver_Type,   // general monotonic cubic solver
+    };
+
+    SkPoint fCoeff[3];
+    Type    fType;
+};
+
+#endif
+